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Yamaha XVS650 - CHAPTER 8. TROUBLESHOOTING; STARTING FAILURE;HARD STARTING

Yamaha XVS650
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IS
THRTB~L
?
STARTING FAILURE/HARD STARTING
---------------------------
EB900000
TROUBLESHOOTING
NOTE:
The
following
guide
for
troubleshooting does
not
cover all the possible causes
of
problems.
It
should be helpful, however, as a
guide
to
troubleshooting. Refer
to
the relative procedure
in this manual
for
inspection,
adjustment
and replacement
of
parts.
STARTING FAILURE/HARD STARTING
FUEL
SYSTEM
Fuel tank
• Empty
• Clogged fuel
filter
• Clogged fuel strainer
• Clogged fuel tank drain hose
• Clogged roll-over valve
• Clogged roll-over varve breather hose
• Deteriorated
or
contaminated fuel
Fuel cock
• Clogged fuel hose
ELECTRICAL
SYSTEM
Spark plug
•
Improper
plug gap
•
Worn
electrodes
• Wire between terminals severed
•
Improper
heat range
• Faulty spark plug cap
Ignition coil
• Broken
or
shorted primary/secondary
• Faulty spark plug lead
• Broken body
Full-transistor system
• Faulty
ignitor
unit
• Faulty pickup coil
8-1
Carburetor
• Deteriorated
or
contaminated fuel
• Clogged
pilot
jet
• Clogged pilot
air
passage
• Sucked-in air
• Deformed float
•
Worn
needle valve
•
Improperly
sealed varve seat
• Improperly adjusted fuel level
•
Improperly
set
pilot
jet
• Clogged starter
jet
• Faulty starter
plunger
• Improperly adjusted starter cable
Air filter
• Clogged air
filter
element
Fuel pump
• Faulty fuel
pump
• Faulty relay
unit
(fuel
pump
relay)
Switch and wiring
• Faulty main switch
• Faulty engine stop switch
• Broken
or
shorted
wiring
• Faulty neutral switch
• Faulty start switch
•
Fau
Ity sidestand switch
• Faulty clutch switch
DJ
Starter motor :
• Faulty starter
motor
• Faulty starter relay
• Faulty relay
unit
(starter circuit
cut-off
relay)
• Faulty starter clutch

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